/usr/share/movit/deconvolution_sharpen_effect.frag is in libmovit4 1.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | // Implicit uniforms:
// uniform vec4 PREFIX(samples)[(R + 1) * (R + 1)];
vec4 FUNCNAME(vec2 tc) {
// The full matrix has five different symmetry cases, that look like this:
//
// D D D C D D D
// D D D C D D D
// D D D C D D D
// B B B A B B B
// D D D C D D D
// D D D C D D D
// D D D C D D D
//
// We only store the lower-right part of the matrix:
//
// A B B B
// C D D D
// C D D D
// C D D D
// Case A: Top-left sample has no symmetry.
vec4 sum = PREFIX(samples)[0].z * INPUT(tc);
// Case B: Uppermost samples have left/right symmetry.
for (int x = 1; x <= R; ++x) {
vec4 sample = PREFIX(samples)[x];
sum += sample.z * (INPUT(tc - sample.xy) + INPUT(tc + sample.xy));
}
// Case C: Leftmost samples have top/bottom symmetry.
for (int y = 1; y <= R; ++y) {
vec4 sample = PREFIX(samples)[y * (R + 1)];
sum += sample.z * (INPUT(tc - sample.xy) + INPUT(tc + sample.xy));
}
// Case D: All other samples have four-way symmetry.
// (Actually we have eight-way, but since we are using normalized
// coordinates, we can't just flip x and y.)
for (int y = 1; y <= R; ++y) {
for (int x = 1; x <= R; ++x) {
vec4 sample = PREFIX(samples)[y * (R + 1) + x];
vec2 mirror_sample = vec2(sample.x, -sample.y);
vec4 local_sum = INPUT(tc - sample.xy) + INPUT(tc + sample.xy);
local_sum += INPUT(tc - mirror_sample.xy) + INPUT(tc + mirror_sample.xy);
sum += sample.z * local_sum;
}
}
return sum;
}
#undef R
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